2 hdd, 1 ide

I recently got my self a second hard drive (Samsung SpinPoint SP0812N IDE ATA/133) to make up form my depressing 20 GB Maxtor 32049H2. I sill have my OS on this drive and would like to keep it this way. I have 2 cd drives on my secondary ide cable and on my primary I have the 20 GB with my OS as master and the 80GB as slave.

My problem is that as soon as both do anything everything goes in to slow motion (literally when I have music on) is this just something you have to live with when u have 2 drives or have I just messed something up? I got the same ide cable I got with a comp 5 years ago (40 wire, I think) but nether drives need an 80 wire so I donít think this is my problem.